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6.5 Fish and Meat Production (aquatic ecosystems harm by fisheries and…
6.5 Fish and Meat Production
meat production
meat production is growing becuase it is becoming cheaper
total meat consumption is likely to double by 2050
globally, three most consumed meats are pork. poultry and beef
industrialized meat production
other half is produced through an industialized intesive factory farm system
factory farms: huge buildings of crowded pens and cages
feedlots- outdoor intense feeding
in feed lots and factory farms animals are fed grain, soybeans,f ishmeals or fish oil (hormones
made possible because of
antibiotics
the green revolution
about 1/2 of the worlds meat comes from livestock grazing on grass in unfence rangelands and enclosed pastures
healthrisks
antibiotic resistence
growth hormones and antibiotic enter the human food chain
industrialized fish and shellfish production
a fishery is a concentration of a particular aquatic species suitable for commercial harvesting in a given body of water
aquaculture or fishfarm is the practice of raising fish in freshwater, ponds, lakes, reservoirs and rice paddies in underwater cages in coastal and deeper ocean waters
advantages
high yeild
reduce over harvesting of fisheres
high efficency
jobs and profits
3 billion people rely on fish and shellfish for protein
57% harvested at full capacity
30% are overfished
meat production harm to the environment
overgrazing
reduced by feedlots and factory farms
habitat destuction
water consumption
these three can't be avoided
a single quarter pound hamburger requires 1700 liters of water
water pollution
livestock waste is washed away straight into water ways
eutrophication
climate change
more greenhouse gases than all of worlds vehicles combined
aquatic ecosystems harm by fisheries and aquacultures
CO2
Many fish are contaminated with toxins like heavy metals. PCB'S and dioxins
overexploitation
1/3 of all fish caught is used to make fishmeal/fish oil to feed farmed fish and livestock
bottom trawling: trawlers fishing boats drag large nets weighed with chains destroying seafloor habitat
problems with aquacultures
large waste output
loss of mangrove and forests estuaries
large inputs of land, grain and fish meal
dense populations= disease
sustainabiluty
ensure waste does not end up in river
only eat line-caught fish
don't feed cattle antibiotics and hormones
meat just isn't sustainable- eat less meat, fish and shellfish products
reduce desertification- don't have so many cattle in one area